PPT-2.2 Measured Numbers and Significant Figures

Length is measured by observing the marked lines at the end of a ruler The last digit in your measurement is an estimate obtained by visually dividing the space between the marked lines Learning Goal . What’s the Diff?. Accuracy. Accuracy: . How . closely a measurement matches true or actual values. To . be accurate only requires the true value (the . bulls eye. ) and one measurement (one arrow to hit . Physical quantities. Any quantity that can be quantified by measurement is a physical quantity . Most of the quantities we deal with as scientists are physical quantities and they will be the ones we will discuss throughout this topic of motion.. Every measurement has UNITS.. Every measurement has UNCERTAINTY.. 2. Accuracy and Precision in . Measurements. Accuracy: how close a measurement is to the accepted value.. Precision: how close a series of measurements are to one another or how far out a measurement is taken.. Physical Science. What is a significant figure?. There are 2 kinds of numbers:. Exact: the amount of money in your account. Known with certainty.. What is a significant figure?. Approximate: weight, height—anything MEASURED. No measurement is perfect.. &. Scientific Notation. Significant Figures. Scientist use significant figures to determine how precise a measurement is. Significant digits in a measurement include all of the known digits plus one estimated digit. Measuring with Precision. Defn: Those numbers that result from directly measuring an object. It shows the precision of the measurement.. Units must be included (no units no sd). The precision of the measurement depends upon the measuring instrument. SC3. Obtain, evaluate, and communicate information about how the Law of Conservation of Matter is used to determine chemical composition in compounds and chemical reactions. . d. Use mathematics and computational thinking … using significant figures.. We make. . QUALITATIVE. . observations of reactions — changes in color and physical state.. We also make. . QUANTITATIVE MEASUREMENTS. , which involve . numbers. .. Use. . SI units . — based on the metric system. using significant figures.. Aim. : . How can we round and calculate using significant figures? . Unit 1: . Chemathematics. 1.4. AGENDA. Introduction. Mini-Lesson. Summary. Work Period. Exit Slip. Do Now. Pacific/Atlantic Method636/584-6688GeneraltutoringeastcentraleduClick to advance slidesIn wordsRule 1 All non-zero digits are significantRule 2 Zeros in front of a number are notsignificantRule 3 Z Sections Section 1 Formatting Figures within the Thesis or Dissertation p 2Information in this manual has been modified fromx0000x0000Updated by GC SST Summer 20212Section 1 Formatting Figures within Homework for Chapter 1. Read Chapter 1. HW 1: pp. 26-31: 2,3,8,16,18,19, 28,29,38,39,52,54,56, 62, 68, 73, 74, 75.. Warmup. Perhaps the most recognizable equation in physics comes form Einstein’s theory of relativity: . 780.0 0.0000890. . 91.11. . . 0000. 80000000. Solve the following using correct sig figs:. (89.7 . + . 876) • 0.034 . = ?. 9.0 . +. . 7.25 = ?. 91.0 . •. . 12 . •. . 2.00 = . ?. You are asked to express the number . Mrs. Charniauskaya. Metric System. Scientists all over the world use the same system of units so they can communicate information clearly . This system is called . Système. . Internationale. . d’Unités.